epan/dissectors/packet-sipfrag.c

   1 /* Routines for sipfrag packet disassembly (RFC 3420)
   2  *
   3  * Martin Mathieson
   4  * Based on packet-sdp.c
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "config.h"
  28
  29 #include <epan/packet.h>
  30
  31 /*
  32  * Doesn't do a detailed dissection of the lines of the message, just treat as text.
  33  */
  34
  35
  36 /* Initialize the protocol and registered fields. */
  37 static int proto_sipfrag = -1;
  38 static int hf_sipfrag_line = -1;
  39
  40 /* Protocol subtree. */
  41 static int ett_sipfrag = -1;
  42
  43 void proto_reg_handoff_sipfrag(void);
  44 static void dissect_sipfrag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
  45
  46
  47 /* Main dissection function. */
  48 static void dissect_sipfrag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  49 {
  50     proto_tree  *sipfrag_tree;
  51     proto_item  *ti;
  52     gint        offset = 0;
  53     gint        next_offset;
  54     int         linelen;
  55     char        *string;
  56     gint        lines = 0;
  57
  58     /* Append this protocol name rather than replace. */
  59     col_append_str(pinfo->cinfo, COL_PROTOCOL, "/sipfrag");
  60
  61     /* Add mention of this protocol to info column */
  62     col_append_str(pinfo->cinfo, COL_INFO, ", with Sipfrag");
  63
  64     /* Create sipfrag tree. */
  65     ti = proto_tree_add_item(tree, proto_sipfrag, tvb, offset, -1, ENC_NA);
  66     sipfrag_tree = proto_item_add_subtree(ti, ett_sipfrag);
  67
  68     /* Show the sipfrag message a line at a time. */
  69     while (tvb_reported_length_remaining(tvb, offset) > 0)
  70     {
  71         /* Find the end of the line. */
  72         linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
  73
  74         /* For now, add all lines as unparsed strings */
  75
  76         /* Extract & add the string. */
  77         string = (char*)tvb_get_string(wmem_packet_scope(), tvb, offset, linelen);
  78         proto_tree_add_string_format(sipfrag_tree, hf_sipfrag_line,
  79                                      tvb, offset,
  80                                      linelen, string,
  81                                      "%s", string);
  82         lines++;
  83
  84         /* Show first line in info column */
  85         if (lines == 1) {
  86             col_append_fstr(pinfo->cinfo, COL_INFO, "(%s", string);
  87         }
  88
  89         /* Move onto next line. */
  90         offset = next_offset;
  91     }
  92
  93     /* Close off summary of sipfrag in info column */
  94     col_append_str(pinfo->cinfo, COL_INFO, (lines > 1) ? "...)" : ")");
  95 }
  96
  97 void proto_register_sipfrag(void)
  98 {
  99     static hf_register_info hf[] =
 100     {
 101         { &hf_sipfrag_line,
 102             { "Line",
 103               "sipfrag.line",FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL
 104             }
 105         },
 106     };
 107
 108     static gint *ett[] =
 109     {
 110         &ett_sipfrag
 111     };
 112
 113     /* Register protocol. */
 114     proto_sipfrag = proto_register_protocol("Sipfrag", "SIPFRAG", "sipfrag");
 115     proto_register_field_array(proto_sipfrag, hf, array_length(hf));
 116     proto_register_subtree_array(ett, array_length(ett));
 117
 118     /* Allow other dissectors to find this one by name. */
 119     register_dissector("sipfrag", dissect_sipfrag, proto_sipfrag);
 120 }
 121
 122 void proto_reg_handoff_sipfrag(void)
 123 {
 124     dissector_handle_t sipfrag_handle = find_dissector("sipfrag");
 125     dissector_add_string("media_type", "message/sipfrag", sipfrag_handle);
 126 }
 127
 128